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Energy Harvesting-based Spectrum Access with Incremental Cooperation, Relay Selection and Hardware Noises
(Společnost pro radioelektronické inženýrství, 2017-04)
In this paper, we propose an energy harvesting (EH)-based spectrum access model in cognitive radio (CR) network. In the proposed scheme, one of available secondary transmitters (STs) helps a primary transmitter (PT) forward ...
Performance of a Cognitive Relay Network under AF Relay Selection Scheme with Imperfect Channel Estimation
(Společnost pro radioelektronické inženýrství, 2016-06)
In this paper outage performance of a secondary user (SU) is evaluated under amplify and forward (AF) relay selection scheme with an imperfect channel state information (CSI)while sharing spectrum in an underlay cognitive ...
The Analysis of Closed-form Solution for Energy Detector Dynamic Threshold Adaptation in Cognitive Radio
(Společnost pro radioelektronické inženýrství, 2017-12)
Spectrum sensing is the most important process in cognitive radio in order to ensure interference avoidance to primary users. For optimal performance of cognitive radio, it is substantial to monitor and promptly react to ...
Impact of Noise Power Uncertainty on the Performance of Wideband Spectrum Segmentation
(Společnost pro radioelektronické inženýrství, 2010-12)
The objective of this work is to investigate the impact of noise uncertainty on the performance of a wideband spectrum segmentation technique. We define metrics to quantify the degradation due to noise uncertainty and ...
An Efficient Filter Banks Based Multicarrier System in Cognitive Radio Networks (invited paper)
(Společnost pro radioelektronické inženýrství, 2010-12)
In cognitive radio techniques, OFDM is usually regarded as the physical layer candidate. However, the weaknesses of the OFDM technique, i.e., using plain FFT for spectral analysis , decreased bandwidth efficiency due to ...
An Energy Efficient MAC Protocol for QoS Provisioning in Cognitive Radio Ad Hoc Networks
(Společnost pro radioelektronické inženýrství, 2010-12)
The explosive growth in the use of real-time applications on mobile devices has resulted in new challenges to the design of medium access control (MAC) protocols for ad hoc networks. In this paper, we propose an energy ...
Optimum Detection Location-Based Cooperative Spectrum Sensing in Cognitive Radio
(Společnost pro radioelektronické inženýrství, 2010-12)
Cognitive radio arises as a hot research issue in wireless communications recently, attributed to its capability of enhancing spectral efficiency and catering for the growing demand for bandwidth. As a good embodiment of ...
Sensing Task Allocation for Heterogeneous Channels in Cooperative Spectrum Sensing
(Společnost pro radioelektronické inženýrství, 2010-12)
In the traditional centralized cooperative spectrum sensing, all secondary users sense the same channel. But, for a given channel, there exists detection performance diversity among all the users, due to the different ...
Modulation Schemes for Cognitive Radio in White Spaces
(Společnost pro radioelektronické inženýrství, 2010-12)
In this paper we give an overview and a comparison of the possible waveforms for white space applications. Four physical layer schemes for cognitive radio are selected for study: Orthogonal Frequency Division Multiplexing ...
An Integrated Frequency Reconfigurable Antenna for Cognitive Radio Application
(Společnost pro radioelektronické inženýrství, 2017-09)
A novel integrated antenna that consists of spectrum sensing and frequency reconfigurable antenna, printed on a single substrate is presented here. The integration of both antennas is based on the fact that reasonably large ...